Metronome.



H. GOULLERY.

` METRONDMB. APPLICATION FILED FEB. 24, 190B.-

Patented Apr. 8, 1913.

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H.' COULLBRY.

METRONOMB. l APPLICATION FILED FEBI 24, 1908.

In/vnfor: Ilenrj Cazalla] Patented Apr. 8, 1913.

3 SHEETS-SHEET 3 UNITED sTATEs PATENT oEEIeE. A

HENRI COULLERY, OF LA CHAUX-DE-FONDS, SWITZERLAND.

METRON OME.

T0 all whom t may concern.'

Be it known that I, HENRI COULLERY, engineer, citizen of Switzerland,residing at La Chaux-de-Fonds, Canton of Neuchatel, Switzerland, haveinvented new and useful Improvements in and Relating to Metronomes, ofwhich the following is a specification.

The present invention has for its object an improved metronome.

This instrument differs essentially from the pendulum metronomeshitherto constructed; as compared therewith, it presents the advantageof acting in all positions and it may also be made of very small volume,say in the form of a watch, which renders it very readily portable. Inaddition, the duration of the beats may be regulated during running andwith great precision. Finally, the beats may be rendered sonorous orsilent at will, this adjustment likewise being possible while themetronome is running.

.A -constructional form of metronome in accordance with the presentinvention is illustrated by way of example in the accompanying drawingin which:-

Figures l and 2 represent each of the two sides of the movement in plan.Fig. 3 is a partial section along the broken line A-B-C of Fig. l. Fig.4 is a partial section along the broken line D-E-F G--I-IJ of Fig. 2.Fig. 5 is a section on the lineK-L of Fig. 2. Fig. G is an enlargedvertical section on the axes of the escapement wheel and the cylinder.Figs. 7 and 8 are sections on line M--N of Fig. 6 and illustrate themembers of the escapement when interacting and producing either sonorousor silent beats; the former being obtained by the fall of the teeth ofthe escapement wheel upon the cylinder (Fig. 7) and the latter byprevent-ing this fall.

A spring driving barrel 1 drives the pinion 2 solid with the wheel 3which in its turn drives the wheel 4 of a special escapement; theduration of the vibration of this escapement may vary within very widelimits. The motor spring of the barrel is wound up by lever pendantwinding mechanism, with ratchet 5, pawl G, idle pinion 7, wheel 8 andpinion 9. In this escapement the variation of the duration of theoscillation is obtained by the displacement of the regulating spring 10in such a manner that its extremity 11 acts at variable Specification ofLetters Patent.

Application filed February 24, 1908.

Patented Apr. 8, 1913.

Serial No. 417,509.

kdistances from the axis of the rocking cylinder l2, connected with thebalance 13 by a toothed sector 14 and the pinion l5. This regulatedspring is fixed to a small bar 1G (Figs. 2 and 5) guided by screws 17which bar is held by friction of the spring 13 and is actuated at willby the idle pinion 7 of the lever of the winding mechanism.

The position of the parts represented in Fig. 1 of the accompanyingdrawing is that in which the barrel is being wound up. A bolt 19 capableof sliding in a slot on the outer part of the case of the metronome issolid with a part 2l located inside the frame and in an orifice 22 inwhich the arm Q3 of a lever 24 pivoted at 25 is engaged. One extremity26 of the lever 24 is able to act upon an inclined surface Q7 oi thelever 28 which a spring 29 constantly tends to maintain in contact withthe said extremity 2G of the lever 24.

The small bar 1G is provided with rack teeth 30 in which the idle pinion7 carried by the lever 28 is able to mesh, and in which a pinion 3lsolid with a hand 32 constantly meshes; this hand is displaceable infront of divisions on the dial and intended for indicatingthe number ofbeats made by the metronome per minute.

A spring 34, fixed at 35, is provided with a nose 36 against which theextremity 37 of the lever 24 is able to bear; the free extremity 38 ofthis spring is beveled (Fig. 4) and acts beneath a conical washer 39fixed to one extremity of the spindle 40 of the escapement wheel 4,which is capable of slight displacement with its spindle in thelongitudinal direction of the latter, so that the teeth of the saidwheel 4 acts upon the cylinder either by their base 4l which works withabsolutely the minimum jump necessary, or by their upper extremity 42which is largely chamfered in order to obtain a very great ump. A spring43 tends to keep the spindle oit' the wheel 4 constantly in its `lowerposition (Fig. 4) but the spring 34 is stronger than the spring 43 andthe wheel 4 is thus supported, generally in its highest positioncorresponding to the minimum jump which insures almost silent running ofthe escapement. By the word jump is meant the distance traveled by theescapement wheel between the successive engagements thereof by therocking cylinder.

Upon the spindle 44 of the cylinder l2, there is iixed the hand 45,beating the time upon the dial 33 and (like the hand 32) visible throughthe window 46 set in the rim 47 fixed by means of a notch on the frame20 of the case.

The pinion 9 is fixed to the winding rod 48 carrying the crown 49 ttedfreely upon the pendant of the case.

The parts being in the position represented in Fig. l, if the crown 49be rotated, the barrel l is wound up. In order to obtain beats of thedesired duration, the bolt 19 actuating the lever Q4 must be depressed;the extremity 26 of this lever causes the lever 28 to turn through afraction of a revolution, its idle pinion 7 ceasing to mesh with theratchet 5 but meshing with the rack 30 of the bar 16; the crown 49 isthen acted upon and the bar I6 is brought into the proper position,indicated by the hand 32 during the running of the instrument.

By pressing the bolt 19 right home in the downward direction, theextremity 37 of the lever 24 is caused to rest upon the nose 36 of thespring 34, the extremity 38 of which acts upon the conical washer 39 andarranges the escapement wheel 4 in its lowest position, whichcorresponds to the maximum of jump and renders the beats sonorous.

The form and the dimensions of the parts described and the relativepositions of these parts may vary. The escapement may be of any suitablekind provided that it presents the property of being capable ofregulation within wide limits during the operation of the instrument. i

The instrumentdescribed is generally utilized in music as a metronomeproper, nevertheless it may be used for other purposes, for example, asa revolution meter, vibration counter, etc., it is only necessary toregulate it until it runs synchronously with the engines oi' which it isdesired to arrive at these running factors, which may be read upon thedial.

Having now described my invention I claim as new and desire to secure byLetters Patent l. In a metronome, the combination of a balance, arocking part connected therewith, an escapement wheel adapted to bemoved from one to the other of two operable positions and having teethadapted to engage said rocking part, said teeth being adapted to make alouder sound when engaging said part when in one of said positions thanwhen in the other position, and means for moving said escapement wheelfrom one position to the other.

2. A metronome controlled by a circular spring-balance, anescapement-wheel displaceable longitudinally to its axis and providedwith chamfered teeth, a rocking cylinder connected with the balance andengaging the escapement wheel, in combination with means for producingthe acoustic indication by displacing the escapement wheel and varyingthe jump between the engagements of the escapement mechanism.

3. In a pocket metronome, a circular balance escapement, a displaceablespring controlling the oscillation of said escapement, a winding-crown,in combinat-ion with an idle wheel actuated by the winding crown andcontrolling the displacement of the said spring.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRI COULLERY.

IVitnesses ARNOLD Y. CorrEY,

G.' L. Pi-rILLirs.

Copies of this patent 'may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

